Process for metallizing glass surface

Abstract

Crystallized glass roughened by using a roughening solution having a larger dissolving rate as to a non-crystalline phase compared with a crystalline phase, followed by metallizing by electroless plating shows strong adhesive strength between the crystallized glass substrate and the plated film.

What is claimed is: 
     
       1. A process for metallizing a crystallized glass surface comprising a crystalline phase and a non-crystalline phase which comprises (a) a step of roughening the glass surface with a roughening solution having a larger dissolving rate for the non-crystalline phase as compared with the crystalline phase, said roughening solution being an aqueous solution of a fluoride salt having a pH of 5 to 10;   (b) a step of adsorbing a catalyst which can start an electroless plating reaction on the resulting roughened surface; and   (c) a step of carrying out electroless plating on the roughened surface containing the catalyst; the crystallized glass containing boron, silicon, magnesium and barium in the following proportions and percents by mole;   15<B 2  O 3  <35,   10<SiO 2  <30, and   40<MgO+CaO+BaO<65.   
     
     
       2. A process according to claim 1, wherein the catalyst is in the form of a non-aqueous solution. 
     
     
       3. A process according to claim 1, wherein the roughening solution is at temperatures from 70° to 85° C. 
     
     
       4. A process according to claim 1, wherein the roughened surface containing the catalyst, prior to electroless plating, is washed with water at the same temperature as the temperature of said plating solution. 
     
     
       5. A process according to claim 2, wherein the catalyst comprises Pd in an alkaline or neutral non-aqueous solution. 
     
     
       6. A process according to claim 1, wherein the fluoride salt is potassium fluoride. 
     
     
       7. A process according to claim 1, wherein the fluoride salt is sodium fluoride.